Multiple groups?

[FrozenModerator]

I was wondering if it was possible to add a user to more than one group? If not, is there an addon or something like that I can use in order to do it?

[JamminR]

No, and not to our knowledge.
We wrote in inheritance to allow for various access configurations.
Even most OS permissions systems (Linux/Windows/whatever) are the same themselves and will take the group assignment with most restrictive access, thereby, technically, only allowing one group even if you assign more.